I took the index from the words, converted the variety to binary, additional three zeros, calculated the sha256 digest, took the first A part of the hexadecimal to convert it to binary, additional a few zeros on the eight digits of the binary and got 00000010011 which interprets to 19 https://zenwriting.net/keenanctdp/h1-b-unlocking-the-power-of-bip39-a-comprehensive-look-at-word-lists-and